影响早期胃癌淋巴结转移的多因素分析

目的探讨早期胃癌患者淋巴结转移的临床病理因素。方法回顾性分析1999年1月至2008年6月间行D2手术的369例早期胃癌患者的病例资料,对其年龄、性别、肿瘤位置、肿瘤大小、浸润深度、脉管瘤栓、肿瘤大体类型和分化程度与淋巴结转移的关系进行Logistic回归多因素分析。结果影响早期胃癌淋巴结转移的主要因素有患者的性别、肿瘤大小、浸润深度、脉管瘤栓和肿瘤分化类型,其中肿瘤大小和浸润深度是主要的独立危险因素（P〈0.01）。结论对早期胃癌患者,手术方案的选择需综合患者肿瘤大小、浸润深度、脉管瘤栓、分化程度和性别等因素来制定。     

早期胃癌淋巴结转移的影响因素分析

目的探索早期胃癌淋巴结转移的影响因素。方法回顾性分析2009年1月至2016年1月期间在笔者所在医院接受手术治疗的187例早期胃癌患者的临床资料,探索年龄、性别、肿瘤位置、肿瘤直径、肿瘤数目、浸润深度、组织学类型、大体形态、脉管浸润及局部溃疡与淋巴结转移的关系。结果本组187例早期胃癌患者中,检测出淋巴结转移32例(17.1%)。多因素logistic回归分析结果显示,早期胃癌患者的淋巴结转移与肿瘤直径(OR=2.080,P=0.022)、浸润深度(OR=21.048,P=0.001)、组织学类型(OR=3.507,P=0.018)、脉管浸润(OR=2.406,P=0.009)及局部溃疡(OR=2.738,P=0.001)均有关,肿瘤直径2 cm、浸润深度达黏膜下层、组织学类型为未分化型、存在脉管浸润及存在局部溃疡者的淋巴结转移率较高。结论肿瘤直径、浸润深度、组织学类型、脉管浸润和局部溃疡均是淋巴结转移的影响因素。     

早期胃癌淋巴结转移的相关危险因素分析

目的探讨早期胃癌淋巴结转移的相关危险因素,为合理制定治疗方案提供参考依据。方法对安徽省肿瘤医院胃肠肿瘤外科于2013年2月至2017年11月期间行胃癌根治术的148例早期胃癌患者的临床病理资料进行回顾性研究,对早期胃癌患者的年龄、性别、肿瘤大小、肿瘤部位、大体类型、组织学类型、浸润深度及是否有脉管神经侵犯与淋巴结转移的关系进行单因素及多因素分析。结果本组148例早期胃癌患者中有15例发生淋巴结转移,淋巴结转移发生率为10.14%,其中黏膜内癌的淋巴结转移率为1.43%(1/70),黏膜下层癌的淋巴结转移率为17.95%(14/78)。单因素分析结果显示,早期胃癌患者的年龄、肿瘤大体类型、肿瘤大小、浸润深度及有脉管神经侵犯情况与其淋巴结转移有关(P0.050);多因素logistic回归分析结果显示,肿瘤浸润深度和有脉管神经侵犯是早期胃癌发生淋巴结转移的独立危险因素(P0.050)。结论肿瘤浸润深度及有脉管神经侵犯与早期胃癌淋巴结转移密切相关,术前正确评估淋巴结转移情况对早期胃癌患者的治疗方式选择及判断患者的预后至关重要。     

早期胃癌淋巴结转移的危险因素分析

目的探讨早期胃癌病人淋巴结转移的危险因素,以期为临床治疗方案的选择提供依据。方法回顾性分析我院2010年1月至2013年12月期间收治的早期胃癌病人的临床病理特征与淋巴结转移规律关系。结果共89例早期胃癌病人纳入研究分析,所有病人淋巴结转移率为14.6%(13/89)。肿瘤大体类型分为隆起型、表浅型、凹陷型,其淋巴结转移率分别为10.0%、5.6%及22.0%,各型间淋巴结转移率差异有统计学意义(P =0.000);黏膜内癌与黏膜下癌淋巴结转移率分别为4.9%(2/41)及22.9%(11/48),二者间差异有统计学意义(P =0.016);高分化良好型早期胃癌无淋巴结转移,中分化及低分化早期胃癌淋巴结转移分别为10.3%(3/29)、18.5%(10/54),差异有统计学意义(P =0.000);6例病人伴有脉管癌栓,其中4例发生淋巴结转移。Logistic 回归多因素分析结果显示：肿瘤大体类型、分化程度、浸润深度及脉管癌栓对淋巴结转移具有显著性影响(P <0.05),其比值比(OR)值分别为4.7、3.2、15.1和5.7。病人性别、年龄、肿瘤部位等与淋巴结转移无相关性。结论早期胃癌病人淋巴结转移率低,其转移与否同肿瘤大体类型、浸润深度、分化程度以及脉管癌栓密切相关。     

早期胃癌淋巴结转移潜在危险因素分析

目的:探讨影响早期胃癌淋巴结转移的潜在危险因素,指导胃癌淋巴结清扫术(D1或D2)的合理应用。方法:回顾性分析1995年3月—2010年6月经手术治疗的336例早期胃癌患者的临床病理资料,对影响早期胃癌淋巴结转移的潜在危险因素进行单因素及多因素分析。结果:早期胃癌淋巴结转移与性别(P=0.010)、年龄(P=0.013)、肿瘤部位(P=0.042)、有无合并溃疡(P=0.001)、浸润深度(P<0.0001)、有无脉管癌栓(P<0.0001)有关,合并有溃疡(P=0.012)、浸润至黏膜下层(P=0.008)及有脉管癌栓(P=0.001)是淋巴结转移的独立性危险因素;黏膜内癌淋巴结转移与肿瘤部位(P=0.007)及大小(P=0.010)有关,肿瘤直径>20mm(P=0.041)是黏膜内癌淋巴结转移的独立性危险因素。结论:合并有溃疡、浸润至黏膜下层及有脉管癌栓的早期胃癌患者进行手术时,建议行淋巴结清扫(D2)术;肿瘤直径>20mm黏膜内癌也要考虑行淋巴结清扫(D2)术。     

早期胃癌淋巴结转移和临床病理特征的关系(附467例报道)

目的:探讨早期胃癌病人各临床病理因素与淋巴结转移的关系,为制定合理的治疗方案提供帮助.方法:对467例早期胃癌病人进行回顾性分析,对其年龄、性别、肿瘤大小、大体类型、分化程度、浸润深度、淋巴管癌栓与淋巴结转移的关系进行单因素和多因素分析.结果:影响早期胃癌淋巴结转移的因素主要有:肿瘤大小(最大径,≤2 cm比>2 cm,P<0.01)、分化程度(分化良好比分化不佳,P<0.01)、浸润深度(黏膜层比黏膜下层,P<0.01)、淋巴管癌栓(无比有,P<0.01).Logistic回归多因素分析结果显示,肿瘤大小、分化程度、浸润深度、淋巴管癌浸润均是提示胃癌是否有淋巴结转移的独立因素.结论:早期胃癌淋巴结转移与肿瘤大小、肿瘤分化程度、浸润深度、淋巴管癌栓等因素有关.确定早期胃癌手术方案时,可参考上述因素判断淋巴结转移风险,决定是否行淋巴结清扫术.     

胃黏膜下层癌淋巴结转移临床病理因素分析

【摘要】 目的 研究胃黏膜下层癌淋巴结转移率及其影响因素。 方法 回顾性分析南京医科大学第一附属医院1998年1月至2007年12月手术证实的181例胃黏膜下层癌的临床病理资料,对病人年龄、性别、肿瘤组织学类型、形态学类型、大小、部位、浸润深度、脉管内癌栓等与淋巴结转移的关系进行单因素与多因素分析。 结果 胃黏膜下层癌淋巴结转移率为20.44%。影响胃黏膜下层癌淋巴结转移的因素主要有肿瘤组织学类型（分化型 vs 分化不良型,P =0.0352）、直径大小（＜2cm vs ≥2cm,P =0.0143）、部位（近端胃vs胃体vs远端胃,P =0.0254）及脉管内癌栓（无vs有,P =0.0323）。Logistic回归分析显示肿瘤组织学类型与大小为胃黏膜下层癌淋巴结转移的独立性危险因素。结论 胃黏膜下层癌淋巴结转移与肿瘤组织学类型、大小、部位及脉管内癌栓等因素有关。临床上应参考上述临床病理因素判断淋巴结转移风险,制定合适的治疗方案。     

早期胃癌淋巴结转移规律及影响因素

目的 探讨早期胃癌的淋巴结转移规律,为合理制定手术方案提供依据.方法 回顾性分析1991年1月至2010年12月间在天津医科大学附属肿瘤医院行开腹手术治疗的242例早期胃癌患者的临床病理资料,分析其淋巴结转移规律,并采用Logistic回归模型分析早期胃癌淋巴结转移的高危因素.结果 242例患者淋巴结转移率为9.1％(22/242),其中黏膜内癌为5.5％(10/182),黏膜下癌为20.0％(12/60).14例患者仅第1站淋巴结转移,4例出现跳跃性转移,4例同时出现第1站和第2站甚至第3站淋巴结转移.第1站淋巴结转移18例,以第7组和第3组转移频次最高,各8例;第2站淋巴结转移7例,局限于第8a组(4例)和第9组(3例);第3站淋巴结转移2例,第4sa组和第16b组各1例.多因素分析显示,肿瘤浸润深度(P=0.003,OR=4.386,95％CI:1.656～11.617)和有无脉管瘤栓(P=0.002,OR=13.621,95％CI:2.711～68.447)是早期胃癌淋巴结转移的独立危险因素.结论 早期胃癌的淋巴结转移与肿瘤浸润深度和脉管瘤栓密切相关;术前和术中正确评估早期胃癌的淋巴结转移状态对于手术方案的合理制订至关重要.     

直肠癌淋巴结转移与临床病理特征分析

目的 探讨直肠癌临床病理特征对淋巴结转移的影响。方法 回顾性分析新疆医科大学附属肿瘤医院2007年1月至2009年12月收治的经手术治疗的210例直肠癌病人的临床病理资料,并比较不同因素对直肠癌淋巴结转移的影响。结果 全组病例淋巴结转移率为30.5%,阳性淋巴结清除率为14.5%。性别、民族、年龄、肿瘤长径、侵犯周径、血清CEA、脉管瘤栓和肿瘤位置与直肠癌淋巴结转移无关（P>0.05）。单因素分析显示：浸润深度、组织类型、大体类型和分化程度与直肠癌淋巴结转移有关（P<0.05）。多因素分析表明：浸润深度、大体类型和分化程度是直肠癌淋巴结转移的独立危险因素（P<0.05）。逻辑回归分析显示,影响淋巴结转移强度的因素中：分化程度大于浸润深度;肿块型与溃疡型,肿块型与浸润型的淋巴转移差异有统计学意义（P<0.05）。结论 大体类型、分化程度、组织类型和浸润深度是判断直肠癌生物学行为及淋巴结转移的有效方法;其中大体类型、分化程度和浸润深度是直肠癌淋巴结转移的独立危险因素;肿块型、溃疡型、浸润型的淋巴结转移风险依次增高。     

胸段食管鳞癌淋巴结的转移规律及危险因素分析

目的:分析影响胸段食管鳞癌淋巴结转移的规律及相关危险因素,为外科手术方式的选择及临床治疗提供参考依据。方法:回顾分析2017年1月至2018年12月为180例胸段食管鳞癌患者行胸腹腔镜联合食管癌根治术的临床资料,术中接受二野或三野淋巴结清扫术,将发生淋巴结转移的89例患者作为观察组,未发生淋巴结转移的91例患者作为对照组,统计淋巴结转移率、淋巴结转移位置;并对肿瘤位置、患者年龄、性别、肿瘤大小、肿瘤浸润深度、是否有脉管内癌栓等因素进行单因素分析,对有统计学意义的因素进行多因素Logistic回归分析。结果:胸段食管癌转移率为49.4%,单因素分析显示,肿瘤大小、肿瘤分化、肿瘤浸润深度、脉管癌栓对淋巴结转移的影响有统计学意义(P<0.05);对上述因素进行多因素Logistic回归分析,结果显示肿瘤分化、肿瘤大小、肿瘤浸润深度、脉管内癌栓是影响胸段食管鳞癌转移的独立因素(P<0.05)。结论:胸段食管鳞癌淋巴结转移率较高,食管癌术中进行完整、彻底的二野或三野清扫是非常有必要的;淋巴结转移的相关危险因素为肿瘤分化、肿瘤大小、肿瘤浸润深度、脉管内癌栓等。     

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??Study on related risk factors and prognosis for lymph node metastasis in patients with early gastric cancer YIN Jie, CAI Jun, ZHANG Jun, et al.Department of General Surgery, Beijing Friendship Hospital, Capital Medical University, Beijing 100050,China
Corresponding author: Zhang Zhong-tao, E-mail??zhangzht@medmail.com.cn
Abstract Objective The purpose of study was to analyze the risk factors for lymph node metastasis (LNM) in patients with early gastric cancer (EGC). Methods This study retrospectively reviewed 112 patients who underwent surgery. The clinical characteristics and pathological features were analyzed by using chi-square and binary logistic regression. Results Logistic regression analysis revealed that age, depth of infiltration, neoplasms histologic type and lymphatic embolus were independent risk factors for LNM. Further study has showed that no LNM was observed for patients with mucous cancer, who were over 60 years old and with a highly differentiated tumor without lymphatic embolus. However, LNM would occured if the neoplasms infiltrated within the submucous layer. Conclusion LNM of EGC is related with age, depth of infiltration, histological type of tumor and lymphatic embolus. Therefore, we believed that endoscopic En-bloc dissection might be considered as the surgical treatment for patients with over 60 years old and highly differentiated tumor which invaded mucous layer without lymphatic embolus. With respect to the patients with high risk factors, we recommend that appropriate lymphadenectomy was conducted according to the specific situation.     

157例早期胃癌淋巴结转移特点及预后分析

目的探讨早期胃癌（EGC）临床病理特征和淋巴结转移规律及其对预后的影响。方法回顾性分析1995年10月至2005年10月间经手术治疗的157例EGC的临床病理特征和淋巴结转移规律及患者3年、5年的生存率。结果157例EGC患者有22例（14％）伴有淋巴结转移,其中黏膜癌2例（2.4％）,仅累及N1淋巴结;黏膜下癌20例（27．0％）,除累及N1淋巴结外,有7例同时累及N2淋巴结;两者比较,差异有统计学意义（P〈0．01）。微小胃癌（直径小于或等于0．5cm）者未见有淋巴结转移：直径小于或等于2．0cm和大于2．0cm的胃癌患者．淋巴结转移率分别为6.4％和21．5％;两者比较,差异有统计学意义（P〈0．01）。高分化EGC未见淋巴结转移;中分化及低分化EGC的淋巴结转移率分别为11．1％和20．9％;两者比较,差异有统计学意义（P〈0．01）。有9例出现脉管癌栓．其中4例伴淋巴结转移。Logistic回归多因素分析结果显示,肿瘤大小、分化程度、浸润深度、脉管癌栓均为影响EGC淋巴结转移的独立因素。伴有淋巴结转移的EGC患者3年、5年生存率分别为81．6％和79．5％,明显低于无淋巴结转移者的95．7％和93．2％（P〈0．01）。结论EGC的淋巴结转移主要与肿瘤浸润深度、肿瘤大小、脉管癌栓及肿瘤分化程度密切相关。应根据淋巴结转移的风险合理选择EGC的治疗方式。     

Endoscopic treatment or surgery for undifferentiated early gastric cancer?

BACKGROUND: Although almost all (96%) the surgical cases of undifferentiated intramucosal early gastric cancer (EGC) have been found not to have lymph node metastasis (LNM), local treatment by endoscopic mucosal resection (EMR) is not accepted as an alternative treatment to surgery for this type of EGC. If a subgroup of patients with undifferentiated EGC with negligible risk of LNM can be defined, unnecessary surgery can be avoided. This study was conducted to determine this subgroup among undifferentiated EGC patients in whom the risk of LNM can be highly ruled out in an attempt to identify candidates who can be treated by EMR. METHODS: Data from 175 patients surgically resected for undifferentiated EGC were retrospectively collected, and clinicopathological factors were multivariately analyzed to identify predictive factors for LNM. RESULTS: Multivariate logistic regression analysis identified two independent risk factors for LNM, namely, a large tumor (>/=20 mm, P = 0.011) and presence of lymphatic involvement (P = 0.0005). Using these two risk factors as the predictive factors, LNM was observed in 5.8% of patients who had neither of the two predictive factors, whereas 23.1% or 13.1% of patients with one or two predictive factors had LNM, respectively. In contrast, the LNM rate was calculated to be 60% in patients who had both factors. Lymph node metastasis was not found in any of 6 patients with small intramucosal lesions (<10 mm) without lymphatic involvement. CONCLUSIONS: An intramucosal undifferentiated EGC that is smaller than 10 mm without lymphatic involvement can safely be treated by EMR alone, given the negligible possibility of LNM. When histological examination of endoscopically resected specimens shows lymphatic involvement or unexpectedly larger tumor size than that determined at pre-EMR endoscopic diagnosis, an additional surgical procedure should be considered.     

Laparoscopic lymph node dissection after endoscopic submucosal dissection: a novel and minimally invasive approach to treating early-stage gastric cancer

BACKGROUND AND OBJECTIVE: Endoscopic submucosal dissection (ESD), a newly developed endoscopic mucosal resection (EMR) technique, can completely cure a differentiated mucosal gastric cancer smaller than 2 cm. For early-stage gastric cancers (EGCs) deviating from the above-mentioned criterion, gastrectomy with lymph node dissection is performed for potential risk of lymph node metastasis (LNM). However, many of surgical EGC cases actually do not have LNM, indicating this surgery may not be necessary for many cases of EGC. To avoid this unnecessary surgery, we have introduced laparoscopic lymph node dissection (LLND) after ESD. Standard gastrectomy with extended lymph node dissection is indicated for patients if LLND reveals LNM. We present our novel approach and the preliminary results of EGC patients having potential risk of LNM. METHODS: Five patients with EGC deviating from the EMR criterion underwent the combination of ESD and LLND. ESD was performed using a newly developed insulation-tipped diathermic knife. Lymph nodes, which were determined on the basis of the location of the primary tumor and lymphatic drainage of the stomach, were removed laparoscopically. The lymphatic drainage was visualized by submucosally injecting indocyanine green (ICG) around the post-ESD ulcerative scars during intraoperative gastroscopy. RESULTS: The ESD enabled en bloc resection without any complications. The resected margins of all the lesions were free of cancer cells vertically and horizontally. LLND was successfully performed without any complications. The mean number of the dissected lymph nodes was 15 (range 6 to 22). In 4 of the 5 patients, the dissected lymph nodes were free of cancer cells, and therefore, the combination of ESD and LLND was considered a definitive treatment. The remaining patient was found to have LNM but chose not to undergo any surgery. During follow-ups, the patients' previous quality of life was restored without any tumor recurrence. CONCLUSIONS: The combination of ESD and LLND enables the complete resection of the primary tumor and the histologic determination of lymph node status. This combination treatment is a potential, minimally invasive method, and may obviate unnecessary gastrectomy without compromising curability for EGC patients having the potential risk of LNM.     

右半结肠癌淋巴结跳跃转移高危因素单中心前瞻性观察性研究

目的 探讨右半结肠癌淋巴结转移规律。方法 前瞻性入组2012年10月至2014年12月在北京大学人民医院行完整结肠系膜切除（CME）的病人,按照日本《大肠癌诊疗规范》（第7版）进行淋巴结分站取材和病理学检查,分析阳性淋巴结分布规律、影响淋巴结转移的临床病理因素。结果 右半结肠癌肠旁、中间、中央淋巴结转移发生率分别33.0%、18.3%、16.5%（P=0.005）,肠旁淋巴结转移主要位于距离肿瘤＜10 cm以内组织,但是＞10 cm组织（1.7%）仍有淋巴结转移。淋巴结转移发生率与肿瘤T分期和分化程度有关。T3~T4期病人淋巴结转移发生率,高于T1~T2期（46.2% vs. 9.1%,P＜0.05）。低分化及未分化癌淋巴结转移发生率为64.7%,明显高于高分化癌（0）、中分化癌（36.0%）,P＜0.05,且分化程度越差更易出现肠旁及中央淋巴结转移。幽门下组淋巴结转移发生率为2.6%（3/115）,且均为结肠肝曲癌。14.8%（17/115）的病人出现跳跃性淋巴结转移。结论 右半结肠癌淋巴结转移存在于肠旁、中间、根部系膜组织,术中应常规清扫,结肠肝曲癌还应清扫幽门下淋巴结,CME有助于彻底清扫该区域淋巴结。     

Indication for endoscopic mucosal resection in early signet ring cell gastric cancer

Background The aim of this study was to compare the clinicopathological characteristics of an early signet ring cell carcinoma (SRC) with an early undifferentiated carcinoma (mucinous, poorly differentiated adenocarcinoma) and early differentiated carcinoma (well or moderately differentiated tubular adenocarcinoma, papillary adenocarcinoma) and find indications for endoscopic mucosal resection (EMR) in early SRC. Methods 1520 patients with early gastric cancer (EGC), who underwent a curative gastrectomy, were analyzed retrospectively. Among them, 388 patients with SRC were compared with 253 patients with undifferentiated carcinoma (UDC) and 879 with a differentiated carcinoma (DC). Results SRC was more common in young female patients than UDC. SRC had a tendency to be confined to the mucosa, with smaller size than UDC. The lymph node metastasis rate for SRC was lower than that for UDC, but similar to that of DC. Multivariate analysis revealed lymph node metastasis (LNM) to be associated with the depth of invasion, tumor size, histological type, and lymphatic involvement. SRC had no LNM in the case of a mucosal tumor, smaller than 2cm, and in the absence of lymphatic involvement. The prognosis of SRC was more favorable than UDC. Conclusions Early SRC has different characteristics from early UDC. In view of the lower rate of lymph node metastasis and better prognosis, we suggest that EMR can be performed on patients with early SRC limited to the mucosa, less than 2cm in size, and with no lymphatic involvement.     

Indication for endoscopic treatment based on the risk of lymph node metastasis in patients with undifferentiated early gastric cancer

BackgroundDespite the risk of lymph node metastasis (LNM), the indications of endoscopic submucosal dissection (ESD) has expanded to undifferentiated type (UD-type) early gastric cancer (EGC). There is debate as to whether the endoscopic resection can be used. This study was conducted to evaluate risk factors for LNM in undifferentiated early gastric cancer, implications for the indication of the ESD so as to providing evidence for proper clinical management for UD-type EGC.MethodWe retrospectively analyzed 203 patients with UD-type EGC who underwent gastrectomy for primary gastric adenocarcinoma between 2012 and 2017. We evaluated the relationship between the clinicopathological factors and the presence of LNM using univariable and multivariable logistic regression analyses.ResultsA total of 203 UD-type EGC patients were enrolled, and LNM was positive in 40 cases (19.7%). Multivariable logistic regression analysis identified three independent risk factors for LNM, the tumor size (≥2.0 cm, P < 0.001), depth of invasion (P < 0.001), and lymphatic vessel involvement (LVI, P < 0.001). LNM was observed in 5.9% patients without the three predictive factors in UD-type EGC, whereas 7.7% and 37.7% of patients with one and two risk factors had LNM, respectively. In contrast, the LNM rate was up to be 66.7% in patients with three factors. Of 41 patients satisfying the expanded indication of ESD, 3 patients (7.3%) showed LNM. LNM was not found in any of 12 patients with small intramucosal lesions (<1.0 cm) without LVI.ConclusionsLNM-related risk factors were tumor larger than 2.0 cm, submucosal invasion, and the presence of LVI in UD-type EGC. ESD alone may be sufficient treatment for the intramucosal UD-type EGC that is smaller than 1.0 cm in size. When endoscopically resected specimens show unexpectedly larger tumor size, unexpected submucosal and LVI than that determined at pre-ESD endoscopic diagnosis, an additional gastrectomy with lymphadenectomy should be considered.     

cN0甲状腺微小乳头状癌右侧喉返神经浅面及深面淋巴结转移危险因素分析

目的 探讨cN0甲状腺微小乳头状癌（PTMC）病人右侧喉返神经浅面（Ⅵa区）及深面（Ⅵb区）淋巴结转移的相关危险因素。方法 回顾性分析2012年1月至2015年2月四川大学华西医院甲状腺乳腺外科治疗的294例初诊cN0 PTMC病人的临床资料。均至少行右侧中央区淋巴结清扫。分析右侧Ⅵa区及Ⅵb区淋巴结转移的相关危险因素。结果 中央区淋巴结转移发生率为40.9%,Ⅵa区为23.5%,Ⅵb区为8.5%。浸润甲状腺被膜与Ⅵa、Ⅵb区淋巴结转移无关。右叶PTMC（193例）肿瘤直径>7 mm、气管前淋巴结转移为Ⅵa区淋巴结转移的独立危险因素,气管前、Ⅵa区淋巴结转移是Ⅵb区淋巴结转移的独立危险因素。左叶PTMC（68例）：无Ⅵb区转移者;气管前、喉前淋巴结转移是Ⅵa区淋巴结转移的独立危险因素（P<0.05）。双叶PTMC（33例）：无Ⅵa、Ⅵb区淋巴结转移相关危险因素。结论 对于cN0 PTMC病人,右叶PTMC直径>7 mm、气管前淋巴结转移,或左叶PTMC气管前、喉前淋巴结转移,建议清扫Ⅵa区淋巴结;右叶PTMC气管前、Ⅵa区淋巴结转移,建议清扫Ⅵb区淋巴结;左叶PTMC一般不发生Ⅵb区转移。